Repeat key action for power operated typewriters



REPEAT KEY ACTION FOR POWER OPERATED TYPEWRITERS Filed July 25, 1951Aug. 9, 1955 F. w. SCHREMP ET AL 4 Sheets-Sheet l lSnvemtors FREDERICK WSCHREMP ND tto eg 9, 1955 F. w. SCHREMP 'ET AL 2,714,948

REPEAT KEY ACTION FOR POWER OPERATED TYPEWRITERS Filed July 25, 1951 4Sheets-Sheet 2 FIRST POSITIQN FIG.2

ZSnoentors FREDERICK W. SCHREMP AND 9, 1955 F. w. SCHREMP ET AL2,714,948

REPEAT KEY ACTION FOR POWER OPERATED TYPEWRITERS Filed July 25. 1951 4Sheets-Sheet 3 f oEmoa 25mm Bnven-tors FREDERICK W- SCHREMP AND Aug. 9,1955 F. w. SCHREMP ET AL 2,714,94

REPEAT KEY ACTION FOR POWER OPERATED TYPEWRITERS s f. D m N 4 w A a m PM R m E w R H s t C e S e h S W K 4 m R E D E R F ZOZLWOQ .CqmnfimZ 8 ml 5 9 l 5 2 Y 1 u J d e l i F am neg United States Patent 2,714,948Patented Aug. 9, 1955 REPEAT KEY ACTION FOR POWER OPERATED TYPEWRITERSFrederick W. Schremp, Stamford, and Raymond E. Seymour, Norwaik, Conn.,assignors to Sperry Rand Corporation, a corporation of DelawareApplication July 25, 1951, Serial No. 238,412

9 Claims. (Cl. 197-17) This invention relates to power operatedtypewriters, and particularly to a repeat key action actuated by acontinuously rotating power driven roll.

The present invention provides an improvement in the present Remingtonelectric typewriter where the type bars are power actuated from acontinuously rotating power driven roll by a selective operation ofsuitable release means for the desired typing or other operated device.The improvement forming the present invention is in the power armmechanism of the character shown in the application of Frederick W.Schremp, S. N. 101,450, filed June 25, 1949, now issued as Patent No.2,638,199, May 12, 1953.

The present invention provides a power operating mechanism operableselectively to produce either one complete cycle of operation of a typeaction or other device for each complete revolution of the eccentric onthe power arm or repeated operation of the typing or other device byrepeated power arm operation secured automatically according to theposition of a key lever or other control device. The repeat operation ofthe power driven mechanism is controlled to secure repeat cycles ofoperation automatically through cooperation of parts of the poweroperating mechanism with parts of the typing or other device actuatedthereby so that each complete cycle will be substantially uniform. Inobtaining uniform repeat cycles, the invention provides means controlledby the operation of the typing or other device that will retain thepower arm against repeat operation until the typing or other device hascompleted its own cycle of operation without regard to the repeatoperation set up by the control mechanism.

According to the present invention, the trigger mechanism operated bythe key lever or control mechanism is movable into either of twooperated positions, one for the purpose of securing single completecycles of operation of the power arm and typing or other device, whilethe second position causes the trigger means to operate the tripmechanism to secure continued repeat operations of the power armmechanism automat1cally. The trigger of the present invention isprovided with two shoulders for engagement with the trip arm on the triplever. One shoulder operates the trip lever into disengaged positionrelative the eccentric to secure a single operation of the power arm andone rotation of the eccentric in which the trip arm moves off the end ofthe shoulder of the trigger before the eccentric completes onerevolution after its initial release thereby releasing the trip lever toengage and arrest the operation of the eccentric to secure a singleoperation of the power arm. This is obtained when the trigger is held inone of its two operative positions. In the other operative position thetrigger is moved to operate the trip lever so that as the eccentricnears the end of its first rotation the trip arm will become disengagedfrom the first shoulder and will then be engaged by the second shoulderand held in position to prevent engagement of the trip lever with theeccentric when the power arm reaches the normal or starting position.This provides for the continued rotation of the eccentric onthe powerarm for engagement with the power driven roll and continued repeatoperation of the power arm so long as the trigger is held in the repeatposition.

Due to the speed of operation of a type action or other device on thetypewriter not being as rapid or the same as that of the eccentric andpower arm mechanism, it has been found desirable to control repeatoperation of the power arm in such a way that each type action and otherpower actuated device on the typewriter may complete its cycle ofoperation by the power arm before beginning automatic and successiverepeat operations. This control is obtained according to the presentinvention by providing the bell-cranks operated by the power arms, orsuch other device as may be operated by the power arms, with aprojection movable into position with the operation of the bell-crank toengage and support a complementary part on the power arm such as aroller, in a' 1 position where the power arm will be supported againstcompleting its return movement to the normal or starting position untilthe bell-crank for the type bar or other device has returned to itsnormal or starting position. When the cycle of operation of thebell-crank is completed, the roller will drop off the end of theprojection and allow movement of the power arm into its startingposition. As this movement is completed, a repeat operation will bestarted if the trigger is supported in the repeat position through theoperation of a key lever or other control means.

In the drawings:

Fig. 1 is an enlarged vertical cross section through a typewriter withportions omitted and other portions shown in cross section and brokenaway, illustrating a type action and a key lever actuated trigger andtrip mechanism on one power arm in side elevation in the position ofrest.

Fig. 2 is a view similar to Fig. 1 showing the key depressed into thefirst operative position in which the trigger has operated the triplever to release the eccentric and power arm so that the eccentric hasmoved into engagement with the power driven roll to start a cycle ofoperation.

Fig. 3 is a view similar to Fig. 2 in which the power driven roll hasmoved the eccentric from the Fig.2 position to the maximum operatedposition of the power arm. The key lever has also been depressed to thesecond position for holding the trigger in the repeat position forsecuring repeat operation of the power arm and mechanism operatedthereby.

Fig. 4 is a view similar to the preceding figures, showing a key leverheld in the second or repeat position with the eccentric near the end ofone revolution or cycle of operation in returning to the startingposition. This figure illustrates how a typing or other actuated deviceon the typewriter controls the repeat operation of the power arm untilthe stroke of the actuated device has been completed.

Fig. 5 is a cross section taken on line 5-5 of Fig. l.

The invention is described and shown in the drawings as applied to aRemington electric typewriter, as particularly described and shown in U.S. application Serial No. 101,450 filed June 25, 1949, now issued asPatent No. 2,63 8,199, May 12, 1953. The typewriter mechanism with theexception of those parts illustrated in this and the aforementionedapplication is similar to the structure shown in Patents Numbers2,289,531, July 14, 1942; 2,304,216, December 8, 1942; 2,326,312, August10, 1943; and U. S. application S. N. 66,672, filed December 22, 1948,now issued as Patent No. 2,579,763, December 25, 1951, in view of whichonly those portions of a typewriter are illustrated as are necessary toshow the present invention in association with related typewriter parts.

The drawings show only a single key lever, power arm assembly and typingor other, device actuated thereby in view of the fact that all of theplurality of power operated typing or other devices use the sameduplicate mechanism for their operation.

.A power driven roll 1 is rotatably mounted in the typewriter frame anddriven by an electric motor drive means of conventional form so that theroll will be continuously rotated in one direction as indicated by thearrow. A fulcrum bar as shown in aforemetntioned Patent No. 2,638,199 isemployed in connection with the present invention and is formed with aplurality of spaced parallel transverse slots for receiving andpivotally mounting a plurality of power arms 2, one in each slot, onpivot rod 3 carried thereby. Each power arm comprises a pair of sectionshaving a pivot section 4 and an operating arm section 5.

Pivot section 4 is formed with an aperture to receive pivot rod 3 topivotally mount the right hand end of the power arm on the fulcrum bar.The center portion of arm section 5 is pivotally mounted on stud 6 onthe end of pivot section 4 opposite that mounted on pivot rod 3. Theright hand end of operating arm section 5, as shown in Fig. 1, issecured to the end portion of pivot section 4 near the part mounted onpivot rod 3 by means of co centric stud 7. This eccentric stud ismounted in the arm sections for adjustment to vary the position ofoperating arm section 5 relative to pivot section 4 by moving armsection 5 on stud 6 as a pivot to change the relation of section 5 topivot section 4. This provides an adjustment for varying the operatingstroke of one operating arm relative to another in a manner disclosed insaid aforementioned Patent No. 2,638,199.

The opposite end of operating arm section 5 carries a roller 8positioned for engaging and operating a bell-crank 9 which may be a typebar bell-crank or may operate any other device on the typewriter. Theposition of roller 8 on each power arm of a series for operating thetyping and other devices may be adjusted relative to each other byadjusting the position of roller 8 relative to the plane through stud 6and the center pivot rod 3 by the rotation of eccentric stud 7. Inoperation, roller 8 is engaged with cam face 10 on bell-crank 9 inupward movement of roller 8 during power operation of the power arm tomove bell-crank 9 about pivot rod 11 on which it is mounted with thecorresponding pivoted members for all of the other power operatedactions, so as to produce power operation of a type bar 12 through aconnecting link 13. The operation of other mechanism on the typewriteris also produced through clockwise rotation of a bell-crank 9, or thelike, as shown in Fig. l.

A stub shaft 14 is mounted on pivot section 4 with its axis in spacedparallel relation above power driven roll 1. An eccentric 15 having acam shaped periphery is rotatably mounted beside section 4 on stub shaft14 in a position to have its periphery extend below section 4 to engagethe periphery of power driven roll 1. The inner marginal portion ofeccentric 15 next to section 4 is recessed to provide angular shoulderportions 16 formed to receive and engage retaining finger 17 on one endportion of trip member 18 pivoted at the opposite end at 19 on pivotsection 4 of the power arm. The trip member 18 has another portion ofthe first mentioned end extending in angular relation to retainingfinger 17 and formed with trip finger 20 positioned to engage stop pin21 mounted on pivot section 4 at the lower end of trip member 18 forlimiting the clockwise movement of trip member 18 about its pivot 19, asshown in Figs. 1 to 4. This limit position determines the position ofretaining finger 17 where it engages in the recessed portion ofeccentric 15 having the shoulder portions 16.

A trip lever 25 has its lower end pivotally secured on stud 26 mountedon the lower depending portion of pivot section 4 while the upper endportion is formed with a stop pin 21 for moving trip member 18 in acounterclockwise direction, as shown in Fig. 1, in the clockwisemovement of trip lever 25. A tension spring 28 has one end secured to alaterally projecting portion of trip lever 25, as shown in Fig. 1, whilethe opposite end is secured to an ear extending laterally from tripmember 18. This spring normally rotates trip lever 25 in acounter-clockwise direction and trip member 18 in a clockwise direction,as illustrated in Fig. 1, to engage trip finger 20 with stop pin 21 forlimiting movement of trip member 18 by the spring. The movement of triplever 25 is also limited by stop projection 29 extending through anaperture 'in pivot section t and engaging a portion of pivot section 4forming the edge of the aperture.

A portion of trip lever 25 on the opposite side of pivot stud 26 fromthat part formed with trip projection 27, pivotally mounts toggle link33 thereon by means of pivot stud 31. Toggle link 30 has a free endbifurcated and embracing supporting rod 32 carried by the fulcrum barwhich supports pivot rod 3. This structure is the same as that shown inthe aforementioned Patent No. 2,63 8,199.

The trigger mechanism has a trip rocker 35 provided for each power armassembly. Each trip rocker has a central portion formed to pivotallyengage on rocker pivot rod 36. Rocker pivot rod 36 is suitably mountedin the typewriter frame in a manner well known in the art, as shown inthe aforementioned application. A trigger 37 is pivotally mounted at itslower end at 38 on the rear end of trip rocker 35 and has a recessedportion providing a pair of shoulders arranged in opposite relation onopposite sides of pin 39. l?in 39 is mounted on the rear central portionof trip rocker 35 and projects from one side of the trip rocker, asclearly shown by the drawings, for engagement with one or the other ofthe shoulders formed on trigger 37 to limit pivotal movement on pivot38. Ear it formed on trigger 37 provides an anchor for one end oftension spring 41 having its opposite end anchored to extension 42depending from the rear end of trip rocker 35. Tension spring 41normally operates trigger 37 in a counter-clockwise direction, as shownin Fig. l, for engagement of the lower shoulder of the trigger with pin39, as shown in Fig. 1. This spring 41 normally retains trigger 37 in aposition so that release shoulder 43 on the upper end will be normallypositioned just below trip arm 44 projecting laterally from trip lever25. Trigger 37 will thus be in a position for moving trip lever 25 upondepression of a key lever.

A finger 45 adjacent shoulder 53 forms the upper portion of trigger 37and extends in front of trip arm 44 for cooperation with the shoulder toretain trip arm 44 engaged thereon during the entire upward operativemovement of the trigger. Trigger 4% has a second release shoulder 46 onthe side opposite finger positioned slightly below release shoulder 43and oifset therefrom.

This second release shoulder secures repeat operation of the power armwhile shoulder 43 secures only a single non-repeat operation. A tensionspring 47 has one end anchored to the lower rear end portion of triprocker 35 and the opposite end secured to a fixed portion of thetypewriter, not shown, for normally moving trip rocker 35 in acounter-clockwise direction as shown in Fig. 1.

it will be understood that a trip rocker and trigger assembly as abovedescribed, and of the type referred to in Patent No. 2,638,199, isprovided for each power arm, a

- plurality being arranged in spaced parallel relation below each powerarm in the position illustrated in the drawing. Each trigger assembly isassociated with a power arm and trip mechanism so that a triggermechanism is provided for controlling and operating each power arm.

One of a plurality of key levers is shown at 50 which correspond innumber to the number of type bars and other mechanism for key leveroperation in the typewriter. The key levers are provided at the front ofthe machine to form a keyboard having the usual key caps on each keytrip projection 27 positioned to engage trip finger 20 below leverarranged in one of a plurality of rows in a manner well known in theart. The rear ends of all of the key levers are pivotally mounted on akey lever pivot bar 51 mounted in the typewriter frame in a manner wellknown in the art and shown in the aforementioned patents. Each key lever50 extends forwardly on pivot bar 51 in spaced parallel relation tocarry the key caps at the forward ends in a conventional manner, whilean upwardly extending ear in an intermediate portion of each key levercarries a laterally extending pin 52 engaged over the forward end of atrip rocker 35 so that each key will operate one trip rocker and triggermechanism. The key cap for manual engagement by an operator as usuallyapplied to each key lever is indicated at 53.

Each key lever 50 is movable from normal or inoperative position andindicated by the legend normal position in the drawings. Each key levermay be moved from this normal position to a first position as shown inFig. 2 in full lines and dot and dash lines in Fig. 4 and indicated bythe legend first position. In this first position the trigger mechanismwill be operated to move the trip lever for disengaging the eccentricand securing a single operation of a power arm and a mechanism operatedthereby in a manner to be hereinafter described.

Each key lever 50 is also movable into a repeat position shown in fulllines in Figs. 3 and 4 and indicated by the legend repeat position inFigs. 3 and 4. When the key lever is in this repeat position, ashereinafter described, the trigger mechanism is moved into a positionwhere it will secure repeat operation of the power arm by moving thetrip lever into eccentric disengaging position each time the power armcompletes a cycle of operation.

Means is provided for indicating to the operator when key lever 50 ismanually moved into the first position and for normally arresting themovement of the key lever in this first position. In the formillustrated in the drawings, this consists of a leaf spring 54, one foreach key lever 59, mounted below the respective key lever to engage thebottom edge thereof when it is depressed into the first position. Then,when it is desired to secure a repeat operation of the power arm and thetyping or other devices operated thereby, the operator may manuallydepress key lever 50 through downward pressure on key cap 53 by applyinggreater force in the downward movement of key lever 59 sufiicient toovercome the stiffness of leaf spring 54 and flex it downwardly into therepeat position shown in Figs. 3 and 4. The operator holds key lever 50in the repeat position against the tension of spring 54 as long asrepeat operation of the type action or other device is desired. Keylever 50 will be restored to its normal position upon manual release bythe operator from either the first position or repeat position by spring54 and spring 46 normally tending to rotate key lever 50 and trip rocker35 in a counter-clockwise direction, as shown in Fig. 1.

It has been found that the cycle of operation of a type action and someof the other operated devices on a typewriter varies in the timerequired to complete a movement into the fully operated position andreturn to the starting position, that is different from the timerequired for a complete cycle of operation of the power arm through onerevolution of eccentric 15. Where repeat operations of a type action orother operated device on the typewriter are desired, this ditference inthe timing cycle of the typing or other device with respect to the powerarm timing cycle will cause the power arm to begin a repeat operationbefore the device operated thereby has completed its first cycle ofoperation. This results in a repeat power operation of the devicethrough only a portion of its normal power operation stroke. The secondand subsequent cycles of operation will not be uniform with the firstcycle of operation or each other. Therefore, it is desirable to providemeans for preventing a repeat cycle of operation of a type action orother operative device by its power arm until the cycle of the typeaction or other operative device has been completed.

For this purpose, the type action or other device is provided with meansfor automatically controlling the operation of its power arm to preventa repeat operation of the power arm until the typing or other device hascompleted its cycle of operation. In accomplishing this result pivotsection 4 of the power arm is provided with an angular extension 60 onits free end projecting toward the central portion of bell-crank 9 andcarrying roller 61 rotatably mounted on the laterally extending stud 62.Roller 61 is adapted to engage projection 63 extending outwardly towardthe power arm from the central portion of bell-crank 9. Projection 63 ispositioned on bell-crank 9 so that it will engage under roller 61 whenthe power arm is slightly above the normal or starting position as:shown in Fig. 1. When bell-crank 9 is in the position of rest, orstarting position, projection 63 will terminate in a position adjacentto roller 61 but out of contact with the roller so that the power armmay move from the starting position shown in Fig. l downwardly to begina power operation stroke by bringing eccentric 15 in contact with powerdriven roll 1, as shown in Fig. 2. As the power arm moves downwardlyfrom its upper limit of movement during power operation by eccentric 15being rotated in contact with power driven roll 1 and before thecompletion of a cycle of movement by bell-crank 9, projection 63 willlie in a position that is within the path of movement of roller 61 forengaging roller 61 and support power arm 2 in a position slightly abovenormal or starting position of the power arm.

In operation the mechanism as shown and described herein will begin acycle of movement from the position of the parts as shown in Fig. 1. Fora single non-repeat operation of a type action or other device on thetypewriter the operator manually engages key cap 53 in the usual way andby a finger depression on key cap 53 moves key lever 50 downwardly untilthe bottom edge engages the spring 54. This moves trip rocker 35 in aclockwise direction as shown in Fig. 1 moving trigger 37 upwardly toengage release shoulder 43 with trip arm 44. Trip arm 44 is moved aboutits pivotal mounting on stud 26 in a clockwise direction as shown inFig. 1 so the upper end forming projection 27 engages trip finger 20 oftrip member 18 and moves trip member 13 in a counterclockwise directionto disengage retaining finger 17 from. angular shoulder portions 16 ofeccentric 15. The eccentric is thereby released for free rotation onstub shaft 14.

At the same time, the clockwise rotation of trip lever 25 moves pivotstud 31 carrying toggle link 3t) downwardly from the position shown inFig. l causing toggle link 30 to pivot thereon for breaking the toggleconnection so that power arm 2. may rotate on pivot rod 3 in acounter-clockwise direction. This results in the movement of the partsinto the position shown in Fig. 2 where eccentric 15 has the portion ofshortest radius engage the periphery of constantly rotating power drivenroller 1 for starting the power operation of eccentric 15 so that itwill rotate on stub 14.

As eccentric 15 is rotated by power driven roll 1 on stub 14 in acounter-clockwise direction as shown in Figs. 1 and 2 the power arm willbe moved from the position shown in Fig. 2 upwardly about pivot rod 3.This causes roller 8 to move upwardly into engagement with cam face 10of bell-crank 9. Further operation of power arm 2 by rotation ofeccentric 15 in engagement with power roll 1 will move the power armupwardly and operate bell-crank 9 in a clockwise direction to move typebar 12 or other operated device from its normal position of rest intothe fully operated position. In. the case of a type bar, it will bemoved upwardly about its pivot to produce the desired impact with theplaten of the typewriter in a well known manner. This operation of typebar 12 or other devices is obtained through the connecting link 13 whichtransmits the motion of bell-crank 9. Power arm 2 will be moved upwardlyin this power operation through rotation of the eccentric by the powerdriven roll into the position shown in Fig. 3 where the eccentricreaches a position in which the portion of longest radius is directedtoward and is engaged with the periphery of power driven roll 1. Fromthe position shown in Fig. 3 the eccentric 15 continues its movement ina counter-clockwise direction by the driving action of power driven roll1 back to the starting position shown in Fig. 1. As the eccentriccontinues its rotation from the position shown in Fig. 3 power arm 2will move downwardly from the position shown in Fig. 3 toward theposition shown in Fig. 1.

Fig. 3 also shows the position of bell-crank 9 at the end of the powerstroke applied thereto with projection 63 moved into a position underroller 61. Bell-crank 9 will start a counter-clockwise rotation from theposition shown in Fig. 3 toward the position shown in Fig. l as theeccentric completes its rotation from the position shown in Fig. 3 backto the starting position of Fig. 1. When the power arm moves downwardlyfrom the position in Fig. 3 roller 61 will engage projection 63 andretain power arm 2 against further downward movement into the startingposition until such time as the type action or other operated deviceactuated by the movement of bell-crank 9 has substantially returned tostarting position. When bell-crank 9 with its operated device hassubstantially returned to the starting position, projection 63 will moveto the left of roller 61, as shown in Fig. 3, so that the projectionwill disengage from under the roller.

Fig. 4 shows the position where the power arm has moved from theposition shown in Fig. 3 by rotation of the eccentric toward thestarting position to the position where roller 61 engages projection 63.From the position of the parts shown in Fig. 4 in which the power arm ismoving downwardly and bell-crank 9 is moving counter-clockwise witheccentric 15 moving counterclockwise toward the starting position, theeccentric will continue its counter-clockwise movement into the startingposition through the inertia given to it by the power roll. Eccentric 15will move into the starting position where shoulders 16 will engageprojection 17 on trip member 18. Trip member 18 in the position of theparts shown in Fig. 4 is moving into position to engage shoulders 16 onthe eccentric and hold eccentric 15 in the starting position whilebell-crank 9 completes its movement to the starting position. Asbell-crank 9 completes its cycle of movement from the position shown inFig. 4 to that shown in Figs. 1 and 2, roller 61 will ride off the endof projection 63 so that power arm 2 can be operated by gravity and thespring attached thereto, downwardly about pivot rod 3 into the startingposition.

With the key lever operated to the first position and held there arereleased after operation into the first position, the power mechanismincluding eccentric 15 will not produce a repeat operation of the powerarm. The eccentric will move into the starting position from theposition shown in Fig. 4 and be held in the starting position untilroller 61 drops off of the end of projection 63 on bell-crank 9. As thismovement takes place trip arm 44 will have moved off of shoulder 43 andsecond release shoulder 46 will be in a position that will provide forthe movement of trip lever 25 into its counter-clockwise limit ofmovement determined by stop projection 29 so that the center of pivotstud 31 for toggle 30 will be in the plane intersecting the center ofsupporting rod 32 and stud 26. With the toggle having its center in thestraight position, toggle link 30 will engage stop rod'32 and arrestdownward return movement of the power arm in completing the first cycleof operation in the position shown in Fig. l where the power arm will besupported until the key lever is again depressed.

When a repeat operation of the power mechanism is lever will return tothe normal position.

desired, the operator presses downwardly on key cap 53 so that the keylever 50 is moved into the repeat position by pressing the key leverdown sufficiently to overcome the tension of spring 54 with the keymoved into a position below the first position as shown in Figs. 2 and 4to the repeat position, shown in Figs. 3 and 4. In the repeat positionof key lever 50 where the key lever will be held by the operator forobtaining the desired number of repeat operations of the power arm andthe devices operated thereby, trigger 37 will be moved into a positionhigher than that shown in Fig. 2, as illus trated in Figs. 3 and 4,where shoulder 46 will be elevated to the same height as shoulder 43 inFig. 2. The first cycle of operation will be initiated and completed inthe manner described hereinabove in connection with the depression ofthe key lever into the first position. Then, as the power arm mechanismhas the parts moved from the position shown in Fig. 3 to the positionshown in Fig. 4, the retention of trigger 37 in the repeat position bythe depression of the key lever into the lower repeat position as shownin Figs. 3 and 4 will position second release shoulder 46 in a positionto engage trip arm 44 as the parts reach the Fig. 4 position. Eccentric15 will be further operated by power roll 1 to move in acounterclockwise direction from the position shown in Fig. 4 to itsstarting position as shown in Fig. l where trip member 18 will arrestits motion as above described. Then, as roller 61 drops off the end ofprojection 63 on bell-crank 9 through counterclockwise movement ofbellcrank 9 from the position shown in Fig. 4 toward the position shownin Fig. 1, second release shoulder 46 by engaging trip arm 44 in furtherdownward movement of power arm 2 will cause trip lever 25 to move onstud 26 in a clockwise direction and break the toggle to allow continueddownward movement of the power arm with counter-clockwise movement oftrip member 18 to disengage from the eccentric until the position shownin Fig. 2 is reached where the eccentric engages the power roll andstarts a repeat cycle of operation through the positions shown in Figs.2, 3 and 4. Further repeat operations are obtained by holding the keylever in the repeat position. Whenever the repeat operation is to bestopped, the operator releases key lever 50 by disengaging the fingerfrom the key cap 53 so that the key The power arm mechanism willcomplete the cycle of rotation as hereinabove described in which theparts will return to the position shown in Fig. l where they are readyto start a second operation through depression of the key lever.

The invention claimed is:

1. In a power operated typewriter having a power driven roll, aplurality of typing and other operated devices, and a plurality of keylevers, one for each typing and other operated device, the combinationof a plurality of power arms pivoted at one end and each arranged tohave the opposite end engage and operate one of said typing and otheroperated devices in pivotal movement thereof in one direction, aplurality of eccentrics, one eccentric rotatably mounted on each powerarm for peripheral engagement with said power driven roll to move saidpower arm on its pivot in operating one of said devices, trip meanshaving portions latching the eccentrics against rotation and including aplurality of trip levers, each pivotally mounted on one of said powerarms, said key levers being operable into eitherof two positions vforoperating said trip levers, trigger means operable by each key lever andhaving a pair of trip lever engaging portions independently engageablewith a trip lever of the corresponding power arm, one of said trip leverengaging portions being operable to engage and move said trip lever forreleasing said eccentric in one of the positions of said key lever forproducing a single cycle of operation of a power arm and the other ofsaid trip lever engaging portions being engageable with a trip lever formoving and maintaining said trip lever disengaged from said eccentricwhen the key lever is moved into the other of said two positions forproducing repeat operations of said power arm.

2. In a power operated typewriter having a power driven roll, aplurality of typing and other operated devices and a plurality of keylevers, one for each typing and other operated device, the combinationof a plurality of power arms pivoted at one end and each arranged tohave the opposite end engage and operate one of said typing and otheroperated devices in pivotal movement thereof in one direction, aplurality of eccentrics, one eccentric rotatably mounted on each powerarm for pcripheral engagement with said power driven roll to move saidpower arm on its pivot in operating one of said devices, trip meanshaving portions latching the eccentrics against rotation and including aplurality of trip levers, each pivotally mounted on one of said powerarms, key lever actuated means for operating each of said trip levers torelease the corresponding eccentric for engagement with and operation bysaid power driven roll for moving said power arm to operate one of saiddevices, whereby each typing or other operated device is power operatedupon manual operation of the corresponding key lever, and means operatedby any of said typing or other operated devices having a partcooperating with a portion of the corresponding power arm to hold saidpower arm from completing a cycle of operation until said typing orother device has substantially completed its cycle of operation.

3. The combination claimed in claim 2, wherein the key lever actuatedmeans is movable into either of two operative positions and has triggermeans operable in one of said positions to actuate a trip lever torelease said eccentric to obtain a single cycle of operation and in theother of said two positions has means to operate and retain said triplever in disengaged position with respect to said eccentric to producerepeat operation of said power arm.

4. In a power operated typewriter as claimed in claim 1, the combinationof means controlled by the typing or other operated device retaining thepower arm against the completion of its cycle of operation until thetyping or other device has substantially completed its cycle ofoperation.

5. A power operated typewriter as claimed in claim 1, wherein each ofsaid typing and other operated devices includes a bell-crank and saidbell-crank is operated by the power arm and has a projection forengaging a complementary part on the power arm for supporting the powerarm against return to the starting position until said bell-crank hassubstantially completed its cycle of operation.

6. In a power operated typewriter as claimed in claim 1, wherein each ofsaid plurality of key levers is movable into either of two operativepositions to produce a single cycle of operation of an associated powerarm in one of said positions and repeating cycles of operation of saidassociated power arm in the second of said positions, arresting meansassociated with each of said key' levers having a semi-positive stoppingaction at said single cycle of operation position of said key lever anddepressible further to said second position of said key lever forproducing said repeating cycles of operation of said power arm.

7. in a power operated typewriter having a power driven roll, aplurality of typing and other operated devices, actuating means for eachof said typing and other operated devices engageable with said powerdriven roll for transmitting power from said power driven roll inoperating said typing and other operated devices, and key lever meansfor each of said actuating means controlling engagement of saidactuating means with said power driven roll; each of said key levermeans being unidirectionally depressible in the normal direction of keylever travel into two successive positions, depression into the first ofsaid positions controlling the engagement of said actuating means withsaid power driven roll in producing a single cycle of operation only ofsuch aforesaid typing or other operated device and further depression ofsaid key lever means into the second of said positions controlling theengagement of said actuating means with said power driven roll wherebyrepeating cycles of operation of said typing or other device arecontinued throughout the retention of said key lever means in saidsecond operating position.

8. In a power operated typewriter as claimed in claim 7, wherein each ofsaid plurality of key lever means is unidirectionally depressible intotwo successive positions, arresting means associated with each of saidkey lever means having a semi-positive stopping action at the first ofsaid two positions of said key lever means, and depressible further tothe second of said positions of said a key lever means.

9. A power operated typewriter having a type bar, a key bar arranged tobe depressed normally a certain distance but being capable of beingdepressed further than normal, power driving means having connectionsconditioned by a normal depression of said key bar to cause said drivingmeans to drive said type bar to printing position for a singleimpression only, said connections further being conditioned bydepressing said key bar further down than normal and in the direction ofits normal movement for causing said driving means to repeatedly drivesaid type bar to printing position, and resilient means positioned tolimit the depression of said key bar to its normal position whilepermitting further depression in opposition to said resilient means.

References Cited in the file of this patent UNITED STATES PATENTS1,227,846 Smathers May 29, 1917 1,789,661 Schulze Jan. 20, 19311,963,285 Woodward June 19, 1934 2,043,393 Pasinski June 9, 1936

